A compact metamaterial SIW diplexer with transmission zeros. Issue 17 (22nd November 2022)

• Record Type: Journal Article
• Authors: El-Gendy, Kareem H.; Abdel Aziz, Ahmed A.; Hagag, Mohamed F.; Abdalla, Mahmoud A.
• Is Part Of: Journal of electromagnetic waves and applications. Volume 36:Issue 17(2022)
• Page Start: 2536
• Page End: 2548
• Publication Date: 2022-11-22
• Subjects: Compact -- Composite right/left-handed (CRLH) -- mixed coupling -- substrate integrated waveguide (SIW) -- transmission zeros (TZs); Electromagnetic waves -- Periodicals; Electromagnetic devices -- Periodicals; 621.3
• DOI: 10.1080/09205071.2022.2098063
• Languages: English
• ISSNs: 0920-5071

Abstract

ABSTRACT: A compact low-loss microstrip diplexer with four controllable transmission zeros (TZs), all less than 41 dB, is presented. The diplexer circuit consists of two coupled gap bandpass filters with a T-junction as a combining circuit. Channels' filters metalize SIW resonators loaded with metamaterial cells operated at zeroth order mode for compactness and low loss operation. For each channel, a fractional bandwidth of 1.9% is obtained. Also, two TZs at both sides of the resonant frequency are obtained by mixed electric and magnetic coupling between channels' resonators. Design methodology for filtering response and placing TZs at certain frequencies are discussed in detail. There is a good agreement between simulation and measurement with isolation better than 40 dB. Moreover, the diplexer has a small size of (1.1×1.43 λg 2 ). Lower and higher TZs are located at 4.75 and 5.69 GHz, for the lower channel, and at 5.4 GHz and 6.2 GHz for the higher channel, respectively.